We found one dictionary that defines the word speak with authority:

General (1 matching dictionary)

1. speak with authority: Longman Dictionary of Contemporary English

▸ Words similar to speak with authority ▸ Usage examples for speak with authority ▸ Idioms related to speak with authority ▸ Wikipedia articles (New!) ▸ Words that often appear near speak with authority ▸ Rhymes of speak with authority ▸ Invented words related to speak with authority